Finally got my airworthiness after several months of waiting. Due to having the airplane ready for inspection (tank out) and having been rescheduled several times, it is finally an airplane. However due to the above, has not been run for three months. Ran perfectly before, and on last shutdown I closed the fuel valve and ran the engine until it quit due to fuel starvation, so the carbs should have been empty of fuel. Got it all reassembled today, put fuel in it and ran it again. However it will not run smoothly with the choke off - runs very rough with substantial drop in RPM. Reapplying the choke causes it to smooth out and run normally. Obviously not getting enough fuel with choke off. Fuel pressure normal and engine head temps in the 150's. Any ideas as to where to start looking? Any help appreciated. Thanks